import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.JDBCUtils.JDBCUtils;

public class getPID extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public getPID() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to
	 * post.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();

		String username = request.getParameter("username");
		if ((username == null) || (username.length() == 0)) {
			out.print("-1");
			out.close();
			return;
		}
		username.trim();

		JDBCUtils jdbcUtils = new JDBCUtils();
		List<Map<String, Object>> selectPIDList = null;
		String selectPIDSQL = "select pid from username_pid where username = ?";
		ArrayList<Object> params = new ArrayList<Object>();
		params.add(username);

		try {
			selectPIDList = jdbcUtils.query(selectPIDSQL, params);
		} catch (SQLException e) {
			out.print("-2");
			jdbcUtils.close();
			e.printStackTrace();
			return;
		}
		if (selectPIDList == null || selectPIDList.size() == 0) {
			out.print("-3");
			jdbcUtils.close();
			return;
		}

		out.print(selectPIDList.get(0).get("pid"));
		jdbcUtils.close();

		out.flush();
		out.close();
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException
	 *             if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
